Peculiarities of FeSi phonon spectrum induced by a change of atomic volume
- Authors: Parshin P.P.1, Chumakov A.I.1,2, Alekseev P.A.1,3, Nemkovski K.S.4, Dubrovinskii L.5, Kantor A.2,5, Perßon J.6, Rüffer R.2
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Affiliations:
- National Research Center Kurchatov Institute
- European Synchrotron Radiation Facility
- National Research Nuclear University “MEPhI,”
- Jülich Centre for Neutron Sciences (JCNS), Heinz Maier-Leibnitz Zentrum (MLZ)
- Bayerisches Geoinstitut
- Jülich Centre for Neutron Science (JCNS) and Peter Grünberg Institut (PGI)
- Issue: Vol 123, No 6 (2016)
- Pages: 1073-1083
- Section: Electronic Properties of Solid
- URL: https://journals.rcsi.science/1063-7761/article/view/191222
- DOI: https://doi.org/10.1134/S1063776116110170
- ID: 191222
Cite item
Abstract
We analyze in detail the results of experimental investigations of the evolution of the thermal vibration spectra for iron atoms in iron monosilicide FeSi depending on two external parameters, viz., temperature T (in the range 46–297 K at pressure P = 0.1 MPa) and pressure P (in the range 0.1 MPa–43 GPa at temperature T = 297 K), obtained by nuclear inelastic scattering of synchrotron radiation. The decrease of the atomic volume is accompanied by a rearrangement of the phonon spectrum, which is manifested, in particular, in the splitting of the low-energy peak in the spectrum and in an increase of the energy for all phonons. The changes of the average energy of the iron atom vibrational spectrum and of the Debye energy with decreasing atomic volume are analyzed. Different versions of FeSi electron spectrum variation, which can be used to explain the observed phonon anomalies, are considered.
About the authors
P. P. Parshin
National Research Center Kurchatov Institute
Author for correspondence.
Email: Parshin_PP@nrcki.ru
Russian Federation, pl. Akademika Kurchatova 1, Moscow, 123182
A. I. Chumakov
National Research Center Kurchatov Institute; European Synchrotron Radiation Facility
Email: Parshin_PP@nrcki.ru
Russian Federation, pl. Akademika Kurchatova 1, Moscow, 123182; Grenoble, 38043
P. A. Alekseev
National Research Center Kurchatov Institute; National Research Nuclear University “MEPhI,”
Email: Parshin_PP@nrcki.ru
Russian Federation, pl. Akademika Kurchatova 1, Moscow, 123182; Kashirskoe sh. 31, Moscow, 115409
K. S. Nemkovski
Jülich Centre for Neutron Sciences (JCNS), Heinz Maier-Leibnitz Zentrum (MLZ)
Email: Parshin_PP@nrcki.ru
Germany, Garching, 85747
L. Dubrovinskii
Bayerisches Geoinstitut
Email: Parshin_PP@nrcki.ru
Germany, Bayreuth, D-95440
A. Kantor
European Synchrotron Radiation Facility; Bayerisches Geoinstitut
Email: Parshin_PP@nrcki.ru
France, Grenoble, 38043; Bayreuth, D-95440
J. Perßon
Jülich Centre for Neutron Science (JCNS) and Peter Grünberg Institut (PGI)
Email: Parshin_PP@nrcki.ru
Germany, Jülich, 52425
R. Rüffer
European Synchrotron Radiation Facility
Email: Parshin_PP@nrcki.ru
France, Grenoble, 38043
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